/* Copyright (c) 2007 HomeAway, Inc.
 *  All rights reserved.  http://www.atomserver.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.atomserver.utils.logic;

import java.text.MessageFormat;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Chris Berry  (chriswberry at gmail.com)
 * @author Bryon Jacob (bryon at jacob.net)
 */
public class TermDictionary<T> {
    private String nameRoot;
    private Map<T, BooleanTerm<T>> map = new HashMap<T, BooleanTerm<T>>();

    public TermDictionary(String nameRoot) {
        this.nameRoot = nameRoot;
    }

    public TermDictionary() {
        this("T");
    }

    public BooleanTerm<T> termFor(T term) {
        if (map.containsKey(term)) {
            return map.get(term);
        } else {
            BooleanTerm<T> booleanTerm = new BooleanTerm<T>(
                    MessageFormat.format("{0}{1}", nameRoot, map.size()),
                    term);
            map.put(term, booleanTerm);
            return booleanTerm;
        }
    }

    public Collection<BooleanTerm<T>> terms() {
        return map.values();
    }
}
